Quantitative Aptitude - Arithmetic Ability Questions

If an equilateral triangle has side 12 cm, then what is the difference (in cm) between the circumradius and inradius?

If 4x - 5y = -37 and 7x + y = -16, then x - y = ______

B is thrice as efficient as A and C is 0.75 times as efficient as A. What is the ratio of number of days taken by A, B and C when they work individually?

Two numbers are 35% and 40% lesser than a third number. By how much percent is the second number to be enhanced to make it equal to the first number?

The mean of a distribution is 18 and the standard deviation is 4.5. What is the value of the coefficient of variation?

Select the odd word from the given alternatives.

Sum of a fraction and thrice of its reciprocal is 73/20. What is the fraction?

If x-1x = 10, then find the value of x4+1x2